import java.util.Scanner;

public class main {
    public static void main (String[] args){
        Scanner sc = new Scanner(System.in);
        String S=sc.nextLine();
        int slen= S.length();

        long count =0;
        long ans=0;
        for(int i =slen-1;i>=0;i--){
            if(S.charAt(i)=='w'){
                count++;
            }else if(S.charAt(i)=='c'){
                ans += count *(count-1)/2;
            }
        }
        System.out.println(ans);
    }
}